Title :
A 2.7 V CMOS GSM/WCDMA continuous-time filter with automatic tuning
Author :
Lindfors, Saska ; Hollman, Tuomas ; Salo, Teemu ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
A 5th-order continuous-time baseband filter with 7-step gain control for a dual-mode cellular phone was implemented. A cascade of a real pole and a ladder filter implementing the complex pole pairs was used for low noise. The GBW of the opamps was made programmable to reduce the power consumption in the GSM-mode. The corner frequency tuning was facilitated by integrating a 1-bit DAC with the filter and a digital tuning circuit separately with an ADC. The integrated input referred noise is 6.9 μV and 13.6 μV and the circuit consumes 13 mW and 21.8 mW in the GSM- and WCDMA-modes, respectively. The IIP3 is +25 dBV in the WCDMA-mode
Keywords :
CMOS analogue integrated circuits; cellular radio; circuit tuning; code division multiple access; continuous time filters; ladder filters; low-power electronics; programmable filters; 13 mW; 2.7 V; 21.8 mW; ADC; CMOS fifth-order continuous-time baseband filter; DAC; GSM mode; WCDMA mode; automatic corner frequency tuning; cascade circuit; complex pole pair; digital tuning circuit; dual-mode cellular phone; gain control; integrated input referred noise; ladder filter; power consumption; programmable opamp GBW; real pole; third-order intercept point; Bandwidth; Baseband; Circuit optimization; Energy consumption; Filters; Frequency; GSM; Laboratories; Multiaccess communication; Prototypes;
Conference_Titel :
Custom Integrated Circuits, 2001, IEEE Conference on.
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-6591-7
DOI :
10.1109/CICC.2001.929713
